JSFiddle - React, Tailwind, and code Playground

by WK_of_Angmar

JavaScript

var checkboxes = 20;

for (var j = 0; j <= checkboxes - 1; j++) {
    var checkbox = document.createElement("input");
    checkbox.setAttribute("type", "checkbox");
    document.body.appendChild(checkbox);
}

var inputElements = document.querySelectorAll("input[type=checkbox]");
for (var i = 0; i <= inputElements.length - 1; i += 8) {
    inputElements[i].checked = true;
    inputElements[i+1].checked = true;
}